docs: def get_adcm(self):
          """
          Absolute deviation around class median (ADCM).
  
          Calculates the absolute deviations of each observation about its class
          median as a measure of fit for the classification method.
  
          Returns sum of ADCM over all classes
          """
          adcm = 0
          for class_def in self.classes:
              if len(class_def) > 0:
                  yc = self.y[class_def]
                  yc_med = np.median(yc)
                  ycd = np.abs(yc - yc_med)
                  adcm += sum(ycd)
          return adcm